Advanced combustion operation in a single-cylinder engine |
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| Authors: | Wang Ying Li Wei Zhou Longbao |
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| Affiliation: | 1. School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR 97331, USA;2. Chevron Energy Technology Company, Richmond, CA 94802, USA;3. School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University–Cascades, Bend, OR 97701, USA;1. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, PR China;2. State Key Laboratory of Engines, Tianjin University, PR China;1. Mechanical Engineering Department, Royal school of Engineering & Technology, Guwahati, 781035, India;2. Mechanical Engineering Department, Assam Engineering College, Guwahati, 781013, India;1. Department of Otorhinolaryngology, Karolinska University Hospital, Karolinska vägen, 171 76, Solna, Stockholm, Sweden;2. Department of Clinical Science, Intervention and Technology (CLINTEC), Division of Ear, Nose- and Throat Diseases, Karolinska Institutet, 171 77, Stockholm, Sweden;3. South General Hospital, Sachs'' Children and Youth Hospital, Sjukhusbacken 10, 118 83, Stockholm, Sweden;4. Department of Medicine, Clinical Epidemiology Unit, Karolinska Institutet, 171 77, Stockholm, Sweden;5. Astrid Lindgren Children´s Hospital, Karolinska University Hospital, Department of Pediatric Infectious Diseases, Eugeniavägen 23, 171 64, Solna, Stockholm, Sweden;6. Department of Public Health Sciences, Division of Global Health, Karolinska Institutet, 171 77, Stockholm, Sweden;7. Public Health Agency of Sweden, Nobels väg 18, 171 65, Solna, Sweden;8. Department of Radiology, Karolinska University Hospital, Karolinska Vägen, 171 76, Solna, Stockholm, Sweden |
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| Abstract: | In this paper advanced combustion concepts such as HCCI and PCCI were studied in a single-cylinder engine. PCCI was achieved by the combination of part aspiration and part direct injection of DME in the experiments, which was a compromise to obtain HCCI in that only a portion of the fuel was premixed and the portion of combustion was still controlled by the injection timing. Basic investigations toward the PCCI and HCCI combustion in a DME engine were carried out. DICI operation was also conducted to make a comparison. Results showed that as for the PCCI combustion operation, pmax, (dp/dθ)max and heat release rate were between the values of HCCI and DICI operation and they increased with a rise of premixed ratio. The combustion duration for the PCCI combustion was longer than those of HCCI combustion, but was shorter than that of DICI combustion. Furthermore, the combustion duration decreased and the brake thermal efficiency increased with an increase in premixed ratio. CO and HC emissions for the PCCI combustion operation were lower than those of the HCCI engine. In comparison to conventional DICI operation, NOx emissions for the PCCI combustion operation decreased significantly. Experiments also indicated that the fuel injection timing had a great influence on the performance and emissions of a DME engine at a PCCI combustion mode. |
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